As investigations are in progress to develop alloys with
better mechanical properties, the zinc families are no exception.
A few years ago, scientists discovered that it's possible to initiate a large, controlled shape change in certain metal alloys with
a magnet rather than heat.
Engineers found other alloys with
greater corrosion resistance but they lacked the required structural strength and fracture toughness.
In addition to this developmental Vandar grade, the company is expected to introduce two new high-impact Vandar alloys with
wide solidification ranges are more prone to the formation of bands because of a broader mushy zone within the solidifying casting.
Monsanto has just begun a new family of styrenic/PVC alloys with
Triax CBE/1, based on Lustran Elite HH, in a joint effort with Vista Chemical Co.
For alloys with
less than the best castability, it is better to first find geometry that assists castability, and then modify it for allowable stress and deflection.
Section modulus, an attribute of structural geometry, has the capability to increase stiffness and/or reduce stress - a capability that can be very important when applied to alloys with
lower strength and stiffness.
This article reviews the basis for grain refinement and modification, including the optimization of practices for hypoeutectic Al-Si alloys and the performance characteristics of commercial master alloys with
respect to incubation time, fade and trace element interactions.
It is common practice for aluminum foundrymen to modify aluminum-silicon (Al-Si) alloys with strontium (Sr) to change the shape of the silicon and enhance the metal's mechanical properties.
For the research, three Al-Si alloys with different Silicon levels were used.
Finally, it is essential to create new aluminum foundry alloys with
properties that lend themselves more readily to the development of composites for specific applications.